APEX, the Atacama Pathfinder Experiment, has been successfully commissioned and is in operation now. This novel submillimeter telescope is located at 5107 m altitude on Llano de Chajnantor in the Chilean High Andes, on what is considered one of the world's outstanding sites for submillimeter astronomy. The primary reflector with 12 m diameter has been carefully adjusted by means of holography. Its surface smoothness of 17-18 μm makes APEX suitable for observations up to 200 μm, through all atmospheric submm windows accessible from the ground.
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机译：APEX（阿塔卡马探路者实验）已成功调试并开始运行。这款新颖的亚毫米望远镜位于智利高安第斯山脉Llano de Chajnantor上海拔5107 m的地方，被认为是世界上最杰出的亚毫米天文学基地之一。直径为12 m的主反射镜已通过全息术进行了仔细调整。它的表面光滑度为17-18μm，使得APEX可以通过地面上所有接近大气的亚毫米窗口进行高达200μm的观测。
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